Knight's move net

Net question  

Black to play and capture the stones.
There are quite a number of patterns of net; those built on knight's move relations are sometimes missed in games by amateur dan players. This less usual example is taken from a Korean book for use in schools.

Knight's move for clean capture  

After White can do nothing.

Too close by Black  

If is played one line closer, White can do plenty, and if Black resists White's escape, the stones become weak.

Charles Matthews